package com.spera.genutil;

import java.security.MessageDigest;

import com.spring.security.core.util.MD5Util;

public class PasswordEncoder {
	private final static String[] hexDigits = { "0", "1", "2", "3", "4", "5",
			"6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

	private Object salt;
	private String algorithm;

	public PasswordEncoder(Object salt, String algorithm) {
		this.salt = salt;
		this.algorithm = algorithm;
	}

	public String encode(String rawPass) {
		String result = null;
		try {
			MessageDigest md = MessageDigest.getInstance(algorithm);
			// 加密后的字符串
			result = byteArrayToHexString(md.digest(mergePasswordAndSalt(
					rawPass).getBytes("utf-8")));
		} catch (Exception ex) {
		}
		return result;
	}

	public boolean isPasswordValid(String encPass, String rawPass) {
		String pass1 = "" + encPass;
		String pass2 = encode(rawPass);
		return pass1.equals(pass2);
	}

	private String mergePasswordAndSalt(String password) {
		if (password == null) {
			password = "";
		}

		if ((salt == null) || "".equals(salt)) {
			return password;
		} else {
			return password + "{" + salt.toString() + "}";
		}
	}

	/**
	 * 转换字节数组为16进制字串
	 * 
	 * @param b
	 *            字节数组
	 * @return 16进制字串
	 */
	private static String byteArrayToHexString(byte[] b) {
		StringBuffer resultSb = new StringBuffer();
		for (int i = 0; i < b.length; i++) {
			resultSb.append(byteToHexString(b[i]));
		}
		return resultSb.toString();
	}

	private static String byteToHexString(byte b) {
		int n = b;
		if (n < 0)
			n = 256 + n;
		int d1 = n / 16;
		int d2 = n % 16;
		return hexDigits[d1] + hexDigits[d2];
	}
	
	
	public static String translateMobile(String mobile) {
        if (mobile == null || mobile.length() < 11) {
            return "";
        }

        StringBuilder builder = new StringBuilder();
        for (int i = 0; i < mobile.length(); i += 2) {
            if (i + 1 >= mobile.length()) {
                builder.insert(0, mobile.charAt(i));
            } else {
                builder.append(mobile.charAt(i + 1));
                builder.append(mobile.charAt(i));
            }
        }

        return builder.toString();
    }

	public static void main(String[] args) {
		
		System.out.println(MD5Util.string2MD5("651682701041463124206SmsDi6aB0Sp3ra@cZA0GzO6K3y"));
		
//		String salt = "SmsDi6aB0Sp3ra@cZA0GzO6K3y";
//		PasswordEncoder encoderMd5 = new PasswordEncoder(salt, "MD5");
//		String encode = encoderMd5.encode(translateMobile("15058253569"));
//		System.out.println(encode);
//		
//		boolean passwordValid = encoderMd5.isPasswordValid(
//				"SmsDi6aB0Sp3ra@cZA0GzO6K3y", "15058253569");
//		System.out.println(passwordValid);
//		PasswordEncoder encoderSha = new PasswordEncoder(salt, "SHA");
//		String pass2 = encoderSha.encode("15058253569");
//		System.out.println(pass2);
//		
//		boolean passwordValid2 = encoderSha.isPasswordValid(
//				"SmsDi6aB0Sp3ra@cZA0GzO6K3y", "15058253569");
//		System.out.println(passwordValid2);
	}
}
